[jdk11u-dev] RFR: 8289238: Refactoring changes to PassFailJFrame Test Framework [v2]

[Goetz Lindenmaier]

> I backport this for parity with 11.0.21-oracle.

Goetz Lindenmaier has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Backport 15efb2bdeb73e4e255dcc864be1a83450a2beaa8
 - Merge branch 'openjdk:master' into goetz_backport_8285612
 - Backport 0c551b6c01bed302a2fbd1271773c3e231920ddd

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Changes:
  - all: https://git.openjdk.org/jdk11u-dev/pull/2240/files
  - new: https://git.openjdk.org/jdk11u-dev/pull/2240/files/5d66a993..5d66a993

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2240&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2240&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2240.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2240/head:pull/2240

PR: https://git.openjdk.org/jdk11u-dev/pull/2240